And concrete and masonry.
Filing inside vinyl posts with concrete.
The ground is always settling and moving.
Concrete is the foundation of the fence.
Dig the tripod ends into seperate holes with concrete bolt or clamp all to the pole so that you end up with three additional.
I did a little research and on this subject and surprisingly there are a couple websites where this question has been asked with varying answers.
Eighteen inches is not deep enough.
The hollow pvc posts act as forms as i fill them with concrete though it s not necessary to fill them all the way to the top.
You might consider some 1 angle bar or 1 2 rebar to make a tripod.
Having concrete as the foundation of your vinyl fence posts creates a firm base that won t move and minimizes the posts moving.
Typically 1 4 to 1 3 of the post should be underground.
When installing vinyl fence generally a bed of 3 6 inches of gravel is placed in the hole and the post concreted in at the proper depth for the frost line.
Any screws driven through the pvc become embedded in concrete and the rebar ties the two pours together.
After the sections are assembled and plumb fill the post with concrete mix.
Using concrete in the foundation point will allow consistency for all of the vinyl fence posts.
In premix assuming that is what you were going to use you are probably closing in on 1 full bag if not a little more.
Use electrician s or plumber s putty for plugging by rolling it into long strips and wrapping the bottom of the post and concrete pad filling the crack.
If you set your posts at 34 36 inches deep which is very common in this area you would need about a 1 3 wheel barrow of cement to make the height half way up the post.
The corner end and gate.
Vinyl is okay but once its damaged by anything like those high winds we have had lately its done you have to replace the whole panel.
Fill that post hole with concrete.
When you re building a deck a fence a pole building or whatever everyone thinks that the hole must be filled with concrete.
Composite wood is okay but its usually attached to regular wood.
If some oozes out no big deal you can clean it up later.